Although they gained a few Epic-grade items this time, the items were not the main attraction.
They had also gained many Dark Gold or lower items. After all, they were fighting mostly normal monsters during these ten hours. Elite monsters were extremely rare and their drop rates were not that much higher either.
Lu Li also didn't ask everyone to hand in all the items they looted.
The largest gain was most likely in the looting of many different materials. These materials would be stored inside the guild storage, organised, then sent over to the Trade Union to compensate the materials that they provided during the battle.
This battle lasted ten hours. The number of supplies consumed during the battle was incredible.